copperas (usually uncountable, plural copperases)
iron(II) sulfate.
Source: Wiktionary
Cop"per*as, n. Etym: [OE. coperose, F. couperose, fr. (assumed) L. cuprirosa, equiv. to G. cha`lkanqos, i. e. copper flower, vitriol. See Copper and Rose.]
Definition: Green vitriol, or sulphate of iron; a green crystalline substance, of an astringent taste, used in making ink, in dyeing black, as a tonic in medicine, etc. It is made on a large scale by the oxidation of iron pyrites. Called also ferrous sulphate.
Note: The term copperas was formerly synonymous with vitriol, and included the green, blue, and white vitriols, or the sulphates of iron, copper, and zinc.
Source: Webster’s Unabridged Dictionary 1913 Edition
28 November 2024
(noun) the fusion of originally different inflected forms (resulting in a reduction in the use of inflections)
The word “coffee” entered the English language in 1582 via the Dutch “koffie,” borrowed from the Ottoman Turkish “kahve,” borrowed in turn from the Arabic “qahwah.” The Arabic word qahwah was traditionally held to refer to a type of wine.
